package com.saunter.utils.excel;

import java.awt.Color;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder;

import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;

public class ExportExcelUtils {
    public static void exportExcel(HttpServletResponse response, String fileName, ExcelData data) throws Exception {
        // 告诉浏览器用什么软件可以打开此文件
        response.setHeader("content-Type", "application/vnd.ms-excel");
        // 下载文件的默认名称
        response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode(fileName, "utf-8"));
        response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
        exportExcel(data, response.getOutputStream());
    }

    public static void exportExcel(ExcelData data, OutputStream out) throws Exception {

        XSSFWorkbook wb = new XSSFWorkbook();
        try {
            String sheetName = data.getName();
            if (null == sheetName) {
                sheetName = "Sheet1";
            }
            XSSFSheet sheet = wb.createSheet(sheetName);
            writeExcel(wb, sheet, data);

            wb.write(out);
        } finally {
            wb.close();
        }
    }

    private static void writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {

        int rowIndex = 0;

        rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
        writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
        autoSizeColumns(sheet, data.getTitles().size() + 1);

    }

    private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List<String> titles) {
        int rowIndex = 0;
        if(null != titles) {
            int colIndex = 0;

            Font titleFont = wb.createFont();
            titleFont.setFontName("simsun");
            titleFont.setBold(true);
            // titleFont.setFontHeightInPoints((short) 14);
            titleFont.setColor(IndexedColors.BLACK.index);

            XSSFCellStyle titleStyle = wb.createCellStyle();
//        titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
            titleStyle.setAlignment(HorizontalAlignment.CENTER);
//        titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
            titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);
            titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192), wb.getStylesSource().getIndexedColors()));
//        titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
            titleStyle.setFont(titleFont);
            setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0), wb.getStylesSource().getIndexedColors()));

            Row titleRow = sheet.createRow(rowIndex);
            // titleRow.setHeightInPoints(25);
            colIndex = 0;

            for (String field : titles) {
                Cell cell = titleRow.createCell(colIndex);
                cell.setCellValue(field);
                cell.setCellStyle(titleStyle);
                colIndex++;
            }

            rowIndex++;
        }
        return rowIndex;
    }

    private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List<List<Object>> rows, int rowIndex) {
        if(null != rows) {
            int colIndex = 0;

            Font dataFont = wb.createFont();
            dataFont.setFontName("simsun");
            // dataFont.setFontHeightInPoints((short) 14);
            dataFont.setColor(IndexedColors.BLACK.index);

            XSSFCellStyle dataStyle = wb.createCellStyle();
            dataStyle.setAlignment(HorizontalAlignment.CENTER);
            dataStyle.setVerticalAlignment(VerticalAlignment.CENTER);
            dataStyle.setFont(dataFont);
            setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0), wb.getStylesSource().getIndexedColors()));

            for (List<Object> rowData : rows) {
                Row dataRow = sheet.createRow(rowIndex);
                // dataRow.setHeightInPoints(25);
                colIndex = 0;

                for (Object cellData : rowData) {
                    Cell cell = dataRow.createCell(colIndex);
                    if (cellData != null) {
                        cell.setCellValue(cellData.toString());
                    } else {
                        cell.setCellValue("");
                    }

                    cell.setCellStyle(dataStyle);
                    colIndex++;
                }
                rowIndex++;
            }
        }
        return rowIndex;
    }

    private static void autoSizeColumns(Sheet sheet, int columnNumber) {

        for (int i = 0; i < columnNumber; i++) {
            int orgWidth = sheet.getColumnWidth(i);
            sheet.autoSizeColumn(i, true);
            int newWidth = (int) (sheet.getColumnWidth(i) + 100);
            if (newWidth > orgWidth) {
                sheet.setColumnWidth(i, newWidth);
            } else {
                sheet.setColumnWidth(i, orgWidth);
            }
        }
    }

    private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {
        style.setBorderTop(border);
        style.setBorderLeft(border);
        style.setBorderRight(border);
        style.setBorderBottom(border);
        style.setBorderColor(XSSFCellBorder.BorderSide.TOP, color);
        style.setBorderColor(XSSFCellBorder.BorderSide.LEFT, color);
        style.setBorderColor(XSSFCellBorder.BorderSide.RIGHT, color);
        style.setBorderColor(XSSFCellBorder.BorderSide.BOTTOM, color);
    }
}
